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HP is aware of the recent vulnerabilities commonly referred to as "Spectre" and "Meltdown". HP has published a security bulletin with patches for these issues and a list of impacted systems. We will continue to update the bulletin as more information becomes available and encourage customers to check the bulletin frequently.

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When sending a print job from the software it starts to plot then displays I/O Buffer Overflow (Error 16). The plotter will either stop completely or start to plot strange characters, lines or exhibit other random behavior.

Cause

I/O Buffer Overflow indicates that the plotter's buffer overflowed. When the buffer was almost full, the plotter signaled the Central Processing Unit (CPU) to stop sending data (dropped DTR line voltage on pin 20 for hardware handshake or the plotter sent an XOFF character for software [XON-XOFF] handshake), but the CPU continued to send data and the buffer overflowed.

Several things could cause this problem:

Software is using software handshaking (XON-XOFF) handshake while the plotter is set to hardware handshake. Try setting the plotter's serial handshake to XON-XOFF through the front panel. If possible, try a different software package.

The plotter may be connected to a network or a switching device. See if a direct connection works.

The cable may be pinned out incorrectly. The serial I/O on the computer would not be able to detect the change in Data Terminal Ready (DTR) voltage; consequently, it would continue sending data to the plotter, even though the buffer is overflowing.

WORKAROUND: Try decreasing the baud rate on the plotter and in the software so that data is sent at a slower speed. If lowering the baud rate increases the amount of the plot that comes out, the cable is probably failing. Try an HP manufactured cable (9-pin or 25-pin).

If in possession of an HP 7550A Plus plotter, try using parallel instead of serial.

If none of the above steps provide the solution, the problem is with the interface port on either the PC or the plotter.

Changing the Serial Menu

HP 7550A Plotter

While pressing the ENTER button, press the NEXT DISPLAY button. The LCD should then read: